Troubleshooting Power Supply Units; Troubleshooting Power Source Problems; Troubleshooting Power Supply Unit Problems; Troubleshooting Cooling Problems - Dell EMC PowerEdge MX7000 Field Service Manual

Troubleshooting power supply units

Prerequisites
The following sections provide information on troubleshooting power source and power supply units problems.
NOTE: Power Supply Units (PSUs) are hot-pluggable.

Troubleshooting power source problems

Steps
1. Press the power button to ensure that your system is turned on. If the power indicator does not glow when the power
button is pressed, press the power button firmly.
2. Plug in another working power supply unit to ensure that the system board is not faulty.
3. Ensure that no loose connections exist.
For example, loose power cables.
4. Ensure that the power source meets applicable standards.
5. Ensure that there are no short circuits.
6. Have a qualified electrician check the line voltage to ensure that it meets the needed specifications.
Results
NOTE: Some power supply units require 200-240V AC to deliver their rated capacity. For more information, see the system
Technical Specifications section in the Installation and Service Manual available at www.dell.com/poweredgemanuals.

Troubleshooting power supply unit problems

Steps
1. Ensure that no loose connections exist.
For example, loose power cables.
2. Ensure that the power supply handle LED indicates that the power supply is working properly.
3. If you have recently upgraded your system, ensure that the power supply unit has enough power to support the new system.
4. If you have a redundant power supply configuration, ensure that both the power supply units are of the same type and
wattage.
If the LED You may have to upgrade to a higher wattage power supply unit.
5. Ensure that you use only power supply units with the Extended Power Performance (EPP) label on the back.
6. Reseat the power supply unit.
NOTE: After installing a power supply unit, allow several seconds for the system to recognize the power supply unit and
determine if it is working properly.

Troubleshooting cooling problems

Ensure that the following conditions exist:
● System cover, cooling shroud, EMI filler panel, or back filler bracket is not removed.
● Ambient temperature is not higher than the system specific ambient temperature.
● External airflow is not obstructed.
● A cooling fan is not removed or has not failed.
● The expansion card installation guidelines have been followed.
Additional cooling can be added by one of the following methods:
Troubleshooting your system 71